1971

8.2

2008

6.1

2020

6.4

2006

6.1

1989

6.6

2004

6.4

2022

6.2

2003

6.8

1979

7.7

1988

6.4

2013

4.7

2016

4.8

1996

6.5

1988

6.5

2010

5.8

2005

6.3

2001

7.5

2023

6.7

2018

5.7

1993

7.5